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船过丁坝过程中的船体受力及桨推力变化分析

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丁坝的束流作用会造成坝头外河道流速增加,对过往船舶的航行阻力和螺旋桨推力产生较大影响.该文采用体积力法建立船-桨-舵一体的自航模型,基于RANS方程,结合Realizablek-ε湍流模型,对船过丁坝过程中的船舶受力情况和螺旋桨推力进行了数值模拟;而后,将模拟结果与实验数据进行对比,验证了数值仿真方法的合理性;最后,以河道流速和船舶航速作为变化参数进行数值分析.研究结果表明:船舶纵向力(船体阻力)、横向力和转艏力矩的变化均随着船舶航速的增大而逐渐减小,且横向力的变化呈现双峰曲线的形态;螺旋桨桨前伴流的分布并非相对于船体中纵剖面对称,而是偏向丁坝后方的低速回流区;船舶处于丁坝下游时,高伴流区更集中于船中纵剖面附近.
Analysis of Hull Forces and Changes in Paddle Thrust during Passage of a Ship Passing a Spur Dike
The bundling effect of the super dike will cause an increase in the flow velocity of the river outside the dam head,which will have a large impact on the navigational resistance and propeller thrust of the passing ship.In this paper,the volumetric force method is used to establish a ship-paddle-rudder integrated self-propelled model.Based on the RANS equation,the Realizable k-εturbulence model is combined to numerically simulate the ship force and propeller thrust during the process of ship crossing the super dike.The simulation results are also compared with the experimental data to prove the rationality of the numerical simulation method.Then,the river flow velocity and ship speed are used as the variation parameters for numerical analysis.The study shows that the variation of longitudinal force(hull resistance),transverse force and bow moment of the ship gradually decreases with the increase of the ship speed,and the variation of transverse force shows a double-peaked curve.The distribution of the companion flow in front of the propeller is not symmetrical with respect to the mid-longitudinal profile of the ship,but favors the low velocity return area behind the super dike.The high companion flow area when the ship is downstream of the super dike is more concentrated near the mid-longitudinal profile of the ship.

Spur dikeHydrodynamic characteristicsBody force methodShip-propeller-rudder integration

曾倩、冀楠、范晓飚、马忠鑫、邓小兵

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重庆交通大学航运与船舶工程学院,重庆 400074

丁坝 水动力特性 体积力法 船-桨-舵一体

2023年重庆交通大学科研创新项目

2023S0078

2024

水动力学研究与进展A辑
中国船舶科学研究中心

水动力学研究与进展A辑

CSTPCD北大核心
影响因子:0.594
ISSN:1000-4874
年,卷(期):2024.39(3)